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0ms150250400ms+

About the test

A quick and accurate way to measure how fast your brain and body respond to a visual signal.

Based on millions of tests worldwide, the median human reaction time sits at around 273 milliseconds — where do you stand?

Keep in mind that your device screen and browser add a small amount of latency on top of your true biological speed. A faster device and higher refresh rate display will give you more precise readings.

For a reliable score, complete at least 5 attempts and then share your best result.

Frequently Asked Questions
A Reaction Time Test measures how quickly you respond to a visual stimulus. Here, you click as soon as the screen turns green. It records the gap in milliseconds between the colour change and your click — your brain and body's processing speed.
Under 200ms — Elite (top gamers & athletes)
200–250ms — Excellent (above average)
250–300ms — Average (most healthy adults)
300–400ms — Below average
Over 400ms — Check sleep and hydration
1. Tap the red box to start.
2. Wait — the screen turns green after a random delay.
3. Tap immediately when it turns green.
4. Your result appears instantly below the box.
5. Repeat multiple times for an accurate average.
You clicked before the screen turned green — you were anticipating, not reacting. The random delay prevents guessing. Too Soon results are not counted. Wait patiently for green.
Yes. Screen refresh rate, browser latency, and touch delay all add a few milliseconds. A 144Hz+ monitor is more accurate than 60Hz. Some TVs add up to 150ms of input lag alone.
Yes. Daily practice, fast-paced games, 7–9 hours of sleep, hydration, and regular exercise all help. Most people improve 20–50ms within a few weeks of consistent training.
Sleep deprivation, alcohol, dehydration, aging, anxiety, and certain medications all slow reflexes. Even mild dehydration (1–2% body weight) measurably reduces processing speed.
Yes. Pro gamers and athletes in cricket, tennis, and combat sports use reflex tests daily. In competitive gaming, even 20ms faster can decide a gunfight. Many pros test before every ranked session as a warm-up.
Average visual reaction time is 200–250ms. The global median is around 273ms. Auditory reaction is slightly faster (~150–180ms) because sound reaches the brain faster. Reflexes peak in the late teens to early 20s.
At least 10 attempts give a reliable average. First 1–2 results are usually slower as you warm up. Use the Share button to copy your best score and share with friends.
Complete Guide to Reaction Time

What Is Reaction Time and Why Does It Matter?

Reaction time is the total time between a sensory stimulus appearing and your physical response beginning. In everyday life it determines how fast you brake a car, catch a falling object, or respond in any split-second situation — from cricket to competitive gaming.

Scientifically, it measures your entire nervous system chain: eyes detect change → brain processes signal → motor nerves fire → muscles move. This entire sequence happens in fractions of a second, yet small improvements carry real-world impact.

How This Test Works

When you tap to start, a random delay of 1.5 to 5 seconds begins. This randomness prevents anticipation. When the box turns green, the clock starts. The moment you tap, it stops. That difference in milliseconds is your score.

💡 This measures simple reaction time — one stimulus, one response. It is always faster than choice reaction time where you must decide between options first.

The Science in Milliseconds

  • 0ms: Screen turns green. Photons hit your retina.
  • 20–40ms: Signal travels from retina to visual cortex.
  • 40–100ms: Visual cortex processes the change, signals motor cortex.
  • 100–200ms: Motor cortex fires, signals travel to your hand.
  • 150–300ms: Finger moves. Tap registered.

Your brain begins responding before you are even consciously aware of seeing the green screen — a remarkable example of biological speed.

Reaction Time and Age

Reflexes peak in the late teens to early 20s, then decline about 1–2ms per year. By age 40 most people are 20–30ms slower than their peak. However, active healthy older adults consistently outperform sedentary young adults — lifestyle matters far more than age.

For Gamers and Athletes

Professional players in CS2, Valorant, and Apex Legends typically achieve 150–200ms — well below the population average. Many use reaction testing as a daily warm-up the same way an athlete stretches before competition.

🎮 The fastest professional gaming reaction times recorded — with optimised high-refresh hardware — consistently sit around 130–160ms, representing the absolute top of human performance.

How to Improve

  • Daily practice: Even 5–10 minutes of testing produces measurable gains within weeks.
  • Sleep: The single biggest factor. One bad night can slow you by 50ms or more.
  • Hydration: Your brain is 75% water. Mild dehydration slows processing speed noticeably.
  • Exercise: Cardio improves blood flow to the brain, directly supporting faster neural processing.
  • Avoid alcohol: Even small amounts measurably depress the central nervous system and slow reflexes.

Tips for Accurate Results

  • Test in a calm, well-lit space without distractions.
  • Rest your finger lightly on the screen between attempts.
  • Take at least 10 attempts and rely on the average, not a single score.
  • Test at the same time daily when tracking trends over time.

Reaction Time and Road Safety

At 60 km/h, a 100ms slower reaction adds 1.7 metres before you even touch the brake. At highway speed that gap is even more critical — one key reason sleep deprivation and alcohol increase accident risk so dramatically.

Final Thoughts

Your reaction time is a genuine window into your nervous system's health, connecting sleep, nutrition, training, and safety in a single measurable number. Test regularly, track your progress, and share your results. The green box is waiting.